Ononot — What is the rank of \begin{pmatrix} 1 & 2 & 3 \\ 0 & 0 & 0 \

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Linear Systemsmedium

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What is the rank of $\begin{pmatrix} 1 & 2 & 3 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \end{pmatrix}$ ?